K-Town is a simplified name, used by the US troops, for Kaiserslautern, which is a city in south-west Germany where many, many US forces are stationed.

You might know it from TV reports about the war in iraq. The famous Landstuhl US military hospital and the US airbase in Ramstein, the largest US airbase outside the US, are located at K-Town.
Unfortunately, Kaiserslautern seems to be too complicated for foreign tounges, so they say K-Town.